I did a search and found tons of information on subnetting, but I need some help. I was wondering if you can lend a hand.<P>I have 4 Excel Sheets with different types of problems, I'll list a few so ...

Okay, first assume that I am completely f*****g stupid BUT, desperate to understand subnet masking. I'm reading the MCSE TCP/IP guide (for some reason I enjoy it) and have reached the Subnet chapter.